Grass Valley 8920ADC User Manual v.2.0
8920ADC
AUDIO A-TO-D CONVERTER
Instruction Manual
071-0595-02
FIRST PRINTING: AUGUST 1999
REVISED PRINTING: SEPTEMBER 2000
2.0software release
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Contents
Preface
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
8920ADC Analog Audio to AES/EBU Converter
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Module Placement in the 8900 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Reference Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Local Onboard Module Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Output Level Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Configuring Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Remote Control Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Module Configuration Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Software Update Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Signal Configuration Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Differential Input, Analog Gain and A/D Converters. . . . . . . . . . . . . . . . . . . . . 19
Digital Reference Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Routing and Control FPGA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Index
8920ADC Instruction Manual iii
Contents
iv 8920ADC Instruction Manual
Preface
About This Manual
This manual describes the features of a specific module of the 8900 Series
Modular Products family. As part of this module family, it is subject to
Safety and Regulatory Compliance described in the 8900 Series frame and
power supply documentation (see the
Instruction Manual
8900TX/8900TF/8900TFN Frames
).
8920ADC Instruction Manual v
Preface
vi 8920ADC Instruction Manual
8920ADC Analog Audio to AES/EBU Converter
Introduction
The 8920ADC converts analog audio to digital audio. The right and left
channel audio inputs enter via a terminal block-to-BNC adapter on the rear
panel. A 48 kHz AES/EBU reference is required to lock the module, which
is connected to the loop through input BNCs. The module outputs 4 AES/
EBU 75 Ω signals through BNCs on the rear panel.
The 8920ADC can modify the outgoing signal to provide channel swapping, channel summing, tone and phase inversion. The remote control
capability supports mode selection and input gain control. The 8920ADC
features:
■
24-bit resolution,
■
AES/EBU loop-through reference input,
48 kHz sampling rate,
■
■
Terminal block input via adapter,
■
Independent input level control from +12 dBu to +28 dBu,
8900 Series Frame compatibility,
■
■
Remote control via ethernet frame I/F, and
■
Remote control lockout via onboard jumper.
8920ADC Instruction Manual 1
1.
2.
3.
8920ADC Analog Audio to AES/EBU Converter
Installation
Installation of the 8920ADC module is a process of:
Placing the module in the desired frame slot,
Cabling and terminating signal ports, and
Configuring the module.
The 8920ADC module can be plugged in and removed from an 8900 Series
frame with power on. When power is applied to the module, LED indica-
tors reflect the initialization process (see
Frame Capacity
Power Up on page 5
).
The 8920ADC module can be installed in all 8900 Series frames but with
varying maximum quantities determined by frame cooling capacity.
Table 1 provides the power capacity, cooling capacity, and maximum
module count for each frame type.
Table 1. Power, Cooling, and Module Capacity of 8900 Frames
Capacity Calculated
Power (W) 60 60 100 100 100
Recommended Module Cooling (W) 30 60 30 90 90
8920ADC Modules 7 10 7 10 10
Note
Module capacity figures assume no other modules are in the frame.
8900T2
Frame
Module Placement in the 8900 Frame
There are ten cell locations in the frame to accommodate either analog or
digital modules. These are the left ten locations. Refer to Figure 1 on page 3.
The two cells on the right are allocated for the power supplies. For addi-
tional information concerning the Power Supply module, refer to the 8900
Frame manual.
8900T2-F
Frame
8900TX
Frame
8900TF
Frame
8900TFN
Frame
The third cell from the right is allocated for the Frame Monitor or Network
Interface controller modules. These modules provide health monitoring
and control options.
2 8920ADC Instruction Manual
Frame Monitor Module or
Network Interface Module
Any 8900 Module
Power
Supplies
(only)
0595-04r1
0595-03
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA1
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA3
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA5
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA2
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA7
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA9
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA4
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA6
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA8
J2
J4
J6
J8
J1 J2
J3 J4
J5 J6
J7 J8
J9 J10
IN
DA10
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
O
U
T
1.
2.
3.
Installation
Figure 1. 8900 Series Frame
8900 modules are interchangeable within the module cells. There are 10
BNC connectors in each cell’s I/O group. The functional assignment of
each connector in a group is determined by the module that is placed in
that cell. The maximum number of modules an 8900 frame can accept is ten.
Figure 2 illustrates the rear connector plate for an 8900 Series frame.
Figure 2. 8900 Series Frame Rear Connector
To install a module in the frame:
Insert the module, connector end first, with the component side of the
module facing to the right and the ejector tab to the top.
Verify that the module connector seats properly against the backplane.
Press the ejector tab in to seat the module in place.
8920ADC Instruction Manual 3
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